60×34-60×25
=45-24
=21;
答:它的34比它的25多21.
Don't ______ too late tonight or you'll get tired tomorrow.[ ]
A.stay up
B.get up
C.wake up
D.clean up
以下哪条血管营养视网膜的外5层()
A.视网膜中央动脉
B.睫状后短动脉
C.睫状后长动脉
D.睫状前动脉
E.以上都不是